Dental bridge.



6. -w. mp0. DENTAL BRIDGE. APPLICATION FILED APR. 7, 1917- Patented June5, 1917.

GEQRGE W. TUBE, @F O a, nnnn asnn.

DENTAL BRIDGE.

To all whom it may concern:

Be it known that I, Gnonen W. Tom), a citizen of the United States,residing at Omaha, in the county of Douglas and State of Nebraska, haveinvented certain new and useful Improvements in Dental Bridges, of whichthe following is a specification This invention relates to animprovement in dental bridges and has for its principal object toprovide porcelain teeth for bridges, each tooth having its posteriorside provided with depressions of such form that the tooth will not bebroken by stresses directed thereto. Another object'is to provideporcelain teeth having their posterior sides of such form that themetallic parts will provide a stronger bridge than usual. Still anotherobject is to provide porcelain teeth for bridges having depressions ofsuch form that the teeth will be more convenient than ordinary whenconnecting them with the metallic parts, and to provide teeth of suchform that a broken tooth may be readily replaced in a bridge withoutremoving the bridge. While the invention is illustrated in connectionwith dental bridges, the construction is'adapted for use in connectionwith plate work.

With the foregoing objects inview, the

Specification of Letters ratenn.

vatures of these also being transversely and longitudinally of thetooth, and extending in length, from near the top to open on theconcaved bottom of the tooth, and extending transversely from a pointmidway between its sides to open onthe' depression 2.

Patented e 5, Edit.

, Application filed April 7, 1917. Serial No. 160,340.

The convexed ridges 4 of the metallic part A of the bridge as best shownin Fig.

' 9, are provided with apertures 5 for receiving the pins 6, and theseridges as well as the convexed ridges 7 of the metallic part have alongitudinal as well as transverse curvature, and when the parts areassembled the ridges 4 will fill the depressions 2, and the ridges 7will fill the depressions 3. And it may therefore be stated that themetallic part A, in addition to being connected with the metallic crowns8, fills the spaces between the teeth as well as the depressions. Whilel have shown a single pin for each tooth, others may be used if desiredand the pins may be dispensed with and cement sub stituted as a holdingmeans in some instances.

On account of the construction as described, the bridge will adequatelysustain stresses. It is well known that the gum tisinvention presents anovel construction, combination and arrangement of parts as describedherein and claimed, and as 111115, trated in the accompanying drawing,wherem,-

Figure 1 is a rear view and Fig. 2 is a front view of a porcelain tooth.Fig. 3 is a side view of the same.

of the teeth and crowns shown in Fig. 5 arranged for a bridge but notconnected. Fig. 7 is a rear view of the bridge shown in Fig. 5. Fig. 8is a section through the- Fig. t is a transversesection on line 44 ofFig. 3. Fig. 5 is a plan view of a bridge. Fig. 6 is a rear view cavedbottom. Numerals 3 indicate concaved depressions of uniform area, thecursue, on account of shrinkage, often fails to adequately support thatpart of a bridge between the crown teeth, and one of the objects of thepresent invention is to provide a metallic part of such form that thestresses directed longitudinally of the teeth will be sustained, and onaccount of the form of the depressions provided for the procelain teeth,the metallic ridges which extend longitudinally of the teeth performthisfunotion.

It will be noted that on account of the fact that the sides are formedconvergent toward the bottom of the porcelain teeth, that the metallicparts between the teeth will have a greater breadth at the base or lowerpart of-the bridge than at the upper part, to adequately resiststresses, and it will be seen that the convexed ridges 7 form a part ofthese comparatively broad portions, the object being to employ the leastquantity of metal consistent with a strong construction.

On account of the convexed metallic parts 4 and 7 and the concaved parts2 and 3 moved and be re laced by another porcelain tooth without in uryto the crowns 8, or re- I -moval of the bridge.

What I claim and desireoto secureby Letters Patent is, Y p

1. In a dental brid e, the combination with a plurality of teet eachhaving aconcaved depression formed in its back midway between its sidesand a pair of concaved depressions extending transversely from a pointmidway between its sides to open on the first named depression, eachdepression extending from near the top to open on the base and thecurvatures of said de ressions being formed longitudinally antransversely of the tooth, a metallic part. having caved base and-havinga concaved depression formed in its back midway between its sides and apair of concaved depressions extending transversely from a oint midwaybetween its sides to open on t e first named depression, each depressionextending from near the top to open on the concaved base and thecurvatures of said' depressions being formed longitudinally andtransversely of the tooth, a metallic part having convexed ridges, eachridge having a longitudi- .'nal and a transverse curvature'for engagingin said depressions when the parts are assembled, and a plurality ofpins engaging the teeth and the metallic part for maintaining said partsin connected relation.

In testimony whereof, I have aflixed my signature in presence of twowitnesses.

GEORGE W. TODD. Witnesses:

HIRAM A. STURGES,

ARTHUR H. STUP-GES.

